When exercising, energy is spent in the body in the form of calories. These calories must be replaced so that the body does not oxidize fat to convert it into energy. So it all depends on your diet. You can develop muscle mass and conserve fat as long as you eat the right diet and there is no caloric deficiency and how much should you eat? That depends on the amount of exercise you do, as well as your weight, height, etc. In my new silhouette we can design a plan to increase your muscle mass without losing the transferred fat.